Paper 60B: Double-Slit Interference, Which-Path Records, and Causal Corridor Reconfiguration in Holosphere Theory Paraxial Propagation, Detector-State Distinguishability, and Paper-60 Phase-Edge Gating

Paper 60B develops a unified Holosphere account of the double-slit experiment while keeping interference loss, measurement, and stable outcome formation conceptually separate. The paper begins with standard slit-resolved paraxial propagation and shows that a coherent two-slit pattern contains a cross term that is absent from the incoherent sum of the two single-slit diffraction patterns. Which-path detection is modeled through the overlap of path-dependent detector states. As those detector states become more distinguishable, fringe visibility decreases continuously and reaches the incoherent limit when the path records are fully distinguishable. The Holosphere interpretation treats a coherence corridor as a physical relation among the source, carrier, aperture, detector, environment, and readout boundary. The apparatus therefore helps determine whether the two paths remain part of one coherence-supporting structure. Boundary incompatibility separates path-conditioned corridors, while later interface competition and pointer-basin capture may select and stabilize a detector record. Physical recoil and apparatus relaxation remain causal, and no faster-than-light signal or strict determinism is required. A separate downstream phase-edge gate produces a modest, symmetric, and resolution-surviving change in the screen distribution. The numerical suite also verifies symmetry, attenuation accounting, slit-field linearity, detector-overlap behavior, and the conditioned quantum-eraser identity.